Electrical heater.



W. S. SHEPPARD.

ELECTRICAL HEATER.

APPLICATION FILED JULY zo, 1913.

1,099,999, Patented June 16,1914u /7 I f 27 A i i 2./ JJ zo VS. SFEPPABIL'OF COLORADO SPRINGS, CQLOKADO.

ELECTRICAL HEATER.

Specification of Letters Patent. Patented June 16, 1914.. Application illed July 25, 1913. Serial No. v781,173. l

To all 'whom 'it may concern Be it known that I, WILBUR S. Snaren, a citizen of the United States, residin at .Colorado S rings, in the county of El aso and State oi) Colorado, have invented certain new and useful Improvements in Electrical Heaters, of which the following is a specifcation.

This invention relates to improvements in electrical heaters and particularly .to such as are adapted especially for use in motor vehicles.

The object in'view is the production of a simple and compact structure occupying a minimum amount of space while capable of radiating a maximum number of heat units.

A further object in view is the provision of an electrical heater of the type indicated having readily accessible parts and susceptible of assemblage and dismantling with ease and facility. Withthese and other objects in view 4the invention comprises an external casing, an internal frame, the casing being formed with an opening of suicient dimensions for enabling the introduction and removal of the frame, a detachably mounted closure for the opening, and electrical heating means sustained y the frame.

The invention also com rises certain other novel constructions, comi inations, andar- 'rangements of parts as will be hereinafter specified and claimed.

In theaccornpanying drawings: Figure 1 is a rspective view of a heater embodying the eatures of the present invention. Fig. 2 is a longitudinal vertical central section taken therethrough, parts beingseen in elevation. Fig. 3 is a transverse vertical sccton therethrough.

Referring to the drawings by numerals, 1 indicates the casing of a housing which in the preferred embodiment as illustrated in the accompanyin drawings consists of a rectangular tubu ar casing having open ends. The casing 1 preferably consists of sheet metal and for facility of distribution of heat units may be provided with apertures 2, 2, the casing being lined internally with wire gauze or mh 3. T-he gauze is preferably held in place by bolts 0r other suitable attaching means 4 distributed appropriately about, the casing 1.

Arranged within the casing 1 is a heater frame 5 the frame being rectangular in form. Each of the end members of the frame 5 is formed with a series of apertures 5 through which extend the tubes 6, each of the tubes being secured in place ,in any preferred manner as by having its end ,p0rt10n splitl or cut into a series of tabs and the latter being bent to a radial position as indicated by 7. Surrounding each tube 6 is a wrappuig of asbestos 8. As many oi Lhe tubes 6 may be provided as desired but for a heater of average size I prefer to employ three, and each is provided with a resistance 9. This resistance 9 preferably consists of a winding of German silver wire or other resistant conductor wound above the outside of the asbestos wrapping 8 of the respective tubes 6. Spaced binding posts 10 and `an intermediate binding post 11 are sustained by one end of the frame 5, each of said binding posts engaging an insulating plate, as for instance, a mica sheet 12. The shank of each binding post 10 and 11 extends through the respective end portion of the frame 5 being surrounded by insulating sleeve 13 which extends through the respective end of frame 5 for obviating the danger of short circuiting. The inner ends of the resistance ,coils of the upper and lower tubes 6 are connected by a conductor 14 which is preferably protected by a noninflarnmable insulation 15, as for instance, a tube of pipe clay. The outer end of the lowermost resistance winding is connected to the lower binding post 10, the corresponding end of the upper-most resistance winding being similarly connected to the upper binding post 10. The outer end of the intermediate winding is connected to the upper binding post- 10 and the inner end is connected by conductor 16 with the intermediate binding post 11, the conductor 16 being insulated by the pipe clay tube.

In practice the three binding posts are employed to enable the extension of line wires therefrom to an appropriate switch, not illustrated, for enabling the supplying of current to any two of the resistance windings at any time or when preferred, and for enabling a supply of current to all three windings at once. It is obvious, of course, that since the windings are o f high resistance material the passing of current therethrough will produce heat a comparatively lar e proportion of which will be radiated am? some of which will be retained byithe asbestos which thus offers means foryf'continuing somewhat the heat supply after the current has been turned o'. The ends of the tubes and adjacent vparts have been referred to as inner and outer, reference being had to the binding posts as the place of the outer end, the opposite ends of the tubes being inner ends. I v

It is to be observed that the casing 1 is formed with open ends for facilitating the frame 5 and the other end is spaced from the frame a sucient distance for accommodating the binding posts 10 and 11. The outer 'face of 'each plate 17 is preferably lined with an asbestos sheet 19 and outside of the asbestos sheet is arranged a linishing plate or sheet 20 for each end of the plate 17. The finishing sheet 20 is preferably the same form of material as that employed in the construction of the casing 1. The end plate l17 which is spaced from the frame 5 is formed with an aperture 21 through which extend the wires from binding posts 10. It will thus become obvious that the struc ture, while particularl adapted for insuring compactness and e ciency in supplying heat from a minimum amount of current consumption is also adapted for greatly facilitatin accessibility to the parts as well as ease an semblage.

To dismantle the structure when in the condition indicated in Fig. 1, it is only necessary to remove the several bolts 18, whereupon the end piece 17 adjacent the binding facility of dismantling and as-5 plates. -One` of the en d plates 17 is fixed to one end of the posts 10, 11 may be readily taken off, and',V

the frame 5 may be withdrawn by withdrawing the opposite end piece, which latter end lpiece is bolted or otherwise" fixed to frame 5. Y

-For avoiding anyvvliability of short circuiting, the aperture 21 is preferably supplied with aninsulator 22 through which a cord 23 for containing the three conductors from the respective bindin posts extends. The lower end plate 20 depends low the casing 1 and is ared laterally and fixed at its lower edge `in a block 24, thus forming supporting feet ortion o veach' finishing for the heater, particularly employed to prevent scorching of the floor mat upon which it rests when in operation.

Having thus described' my invention, wh-at I claim as new is:

1. In a heater of the class described, the combination o f a hollow casing open at its opposite ends, a frame arranged in said casing, heating means carried by said frame, a

plate received in one end of the casing andl removably connected with said frame, a second plate removably received in the op osite end of the casing, and in spaced re ation with respect to said frame, finishing plates applied to the opposite ends of the casing andprojecting below the latter to form feet for supporting the casing spaced from a floor or other base on which it is mounted, connections between said finishing plates and the removable plates received in the ends of the casing, and heater connections arranged in the space between the frame and the plate disposed in spaced relation to the latter.

2. In an electric heater, the combination with a casing having open ends, av frame movably mounted in the casing` and adapted to be shifted through one of t e ends thereof, a plate for closin the last-mentioned end of the casing, sai plate beingI carried by the frame, a plate for closing the opposite end of the casing, the last named plate being spaced from the adjacent end of the frame, electric terminals carried by the lastnamed end of the frame between such end and the adjacent end plate, and electrical heating means sustained by the frame and connected to be supplied with current from said terminals.

3. In an electric heater, the combination of a heater frame, electrical heating means sustained thereby, a finishing casing surrounding the frame, the casing being formed with open ends and the frame being adapted to be moved through one of the ends, plates closing the ends of said casing, connecting means between one of said plates and the frame, finishing lates fixed to the last mentioned plates, an feet pendent from the {inishing plates for sustalning the heater;-

In testimony whereof-I affix my signature in'presence of two witnesses.

WILBUR SHEPPARD.

Witnesses:

W. P. WATERTON, F. L. Rossnacn. 

